The former Disney actress was enjoying a time-out after adapting to life as a single parent and filing for divorce from ex-ice hockey player Mike Comrie last month.
The 27-year-old mum used the pic to show support for mums around the world captioning it: “Hey #moms #westillgotit #loveyourbod.”
The former Lizzie McGuire star is also currently locked in a public argument with former flame Aaron Carter.
Aaron has previously admitted he never got over the American beauty, so when she brought up his name in a recent Cosmo mag interview, the 90s star saw red.
Hilary had been trying to silence rumours her and Aaron were back in contact, but instead seems to have reignited the spat.
She explained: “[Aaron] reaching out through social media? It’s ridiculous! Come on guys.”
Regardless, the mum-of-one hasn’t appeared to have taken it to heart, as she ignored the attack and carried on with her sunny break.